From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: "René Scharfe" <l.s.r@web.de>
Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
Subject: Re: [PATCH 08/15] name-rev: pull out deref handling from the recursion
Date: Fri, 20 Sep 2019 20:13:02 +0200 [thread overview]
Message-ID: <20190920181302.GA26402@szeder.dev> (raw)
In-Reply-To: <5bf3b958-8c95-ae3d-1ae5-df3d57272d8c@web.de>
> > @@ -280,12 +269,16 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
> > if (o && o->type == OBJ_COMMIT) {
> > struct commit *commit = (struct commit *)o;
> > int from_tag = starts_with(path, "refs/tags/");
> > + const char *tip_name;
>
> This should not be const because you allocate the buffer it points to
> right here in the function, in each execution path.
Marking it as const indicates that this function doesn't modify the
buffer where the pointer points at.
> >
> > if (taggerdate == TIME_MAX)
> > taggerdate = commit->date;
> > path = name_ref_abbrev(path, can_abbreviate_output);
> > - name_rev(commit, xstrdup(path), taggerdate, 0, 0,
> > - from_tag, deref);
> > + if (deref)
> > + tip_name = xstrfmt("%s^0", path);
> > + else
> > + tip_name = xstrdup(path);
> > + name_rev(commit, tip_name, taggerdate, 0, 0, from_tag);
>
> tip_name should be free(3)'d here. Except we can't do that because
> name_rev() sometimes stores that pointer in a commit slab. Ugh.
>
> If the (re)introduced leak doesn't impact performance and memory
> usage too much then duplicating tip_name again in name_rev() or
> rather your new create_or_update_name() would likely make the
> lifetimes of those string buffers easier to manage.
Yeah, the easiest would be when each 'struct rev_name' in the commit
slab would have its own 'tip_name' string, but that would result in
a lot of duplicated strings and increased memory usage.
next prev parent reply other threads:[~2019-09-20 18:13 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-19 21:46 [PATCH 00/15] name-rev: eliminate recursion SZEDER Gábor
2019-09-19 21:46 ` [PATCH 01/15] t6120-describe: correct test repo history graph in comment SZEDER Gábor
2019-09-20 21:47 ` Junio C Hamano
2019-09-20 22:29 ` SZEDER Gábor
2019-09-28 4:06 ` Junio C Hamano
2019-09-19 21:46 ` [PATCH 02/15] t6120-describe: modernize the 'check_describe' helper SZEDER Gábor
2019-09-20 21:49 ` Junio C Hamano
2019-09-19 21:46 ` [PATCH 03/15] name-rev: use strip_suffix() in get_rev_name() SZEDER Gábor
2019-09-20 16:36 ` René Scharfe
2019-09-20 17:10 ` SZEDER Gábor
2019-09-19 21:46 ` [PATCH 04/15] name-rev: avoid unnecessary cast in name_ref() SZEDER Gábor
2019-09-20 16:37 ` René Scharfe
2019-09-19 21:47 ` [PATCH 05/15] name-rev: use sizeof(*ptr) instead of sizeof(type) in allocation SZEDER Gábor
2019-09-20 15:11 ` Derrick Stolee
2019-09-20 15:40 ` SZEDER Gábor
2019-09-20 16:37 ` René Scharfe
2019-09-19 21:47 ` [PATCH 06/15] t6120: add a test to cover inner conditions in 'git name-rev's name_rev() SZEDER Gábor
2019-09-20 15:14 ` Derrick Stolee
2019-09-20 15:44 ` SZEDER Gábor
2019-09-19 21:47 ` [PATCH 07/15] name-rev: extract creating/updating a 'struct name_rev' into a helper SZEDER Gábor
2019-09-20 15:18 ` Derrick Stolee
2019-09-22 8:18 ` [PATCH] name-rev: rewrite create_or_update_name() Martin Ågren
2019-12-09 12:43 ` SZEDER Gábor
2019-09-19 21:47 ` [PATCH 08/15] name-rev: pull out deref handling from the recursion SZEDER Gábor
2019-09-20 15:21 ` Derrick Stolee
2019-09-20 17:42 ` SZEDER Gábor
2019-09-20 16:37 ` René Scharfe
2019-09-20 18:13 ` SZEDER Gábor [this message]
2019-09-20 18:14 ` SZEDER Gábor
2019-09-21 9:57 ` SZEDER Gábor
2019-09-21 12:37 ` René Scharfe
2019-09-22 19:05 ` SZEDER Gábor
2019-09-23 18:43 ` René Scharfe
2019-09-23 18:59 ` SZEDER Gábor
2019-09-23 19:55 ` René Scharfe
2019-09-23 20:47 ` SZEDER Gábor
2019-09-24 17:03 ` René Scharfe
2019-09-26 17:33 ` SZEDER Gábor
2019-09-21 12:37 ` René Scharfe
2019-09-21 14:21 ` SZEDER Gábor
2019-09-21 15:52 ` René Scharfe
2019-09-19 21:47 ` [PATCH 09/15] name-rev: restructure parsing commits and applying date cutoff SZEDER Gábor
2019-09-21 12:37 ` René Scharfe
2019-09-19 21:47 ` [PATCH 10/15] name-rev: restructure creating/updating 'struct rev_name' instances SZEDER Gábor
2019-09-20 15:27 ` Derrick Stolee
2019-09-20 17:09 ` SZEDER Gábor
2019-09-19 21:47 ` [PATCH 11/15] name-rev: drop name_rev()'s 'generation' and 'distance' parameters SZEDER Gábor
2019-09-19 21:47 ` [PATCH 12/15] name-rev: eliminate recursion in name_rev() SZEDER Gábor
2019-09-19 21:47 ` [PATCH 13/15] name-rev: cleanup name_ref() SZEDER Gábor
2019-09-19 21:47 ` [PATCH 14/15] name-rev: plug a memory leak in name_rev() SZEDER Gábor
2019-09-19 21:47 ` [PATCH 14/15] name-rev: plug memory leak in name_rev() in the deref case SZEDER Gábor
2019-09-19 22:47 ` SZEDER Gábor
2019-09-19 21:47 ` [PATCH 15/15] name-rev: plug a " SZEDER Gábor
2019-09-20 15:35 ` Derrick Stolee
2019-09-19 21:47 ` [PATCH 15/15] name-rev: plug memory leak in name_rev() SZEDER Gábor
2019-09-19 22:48 ` SZEDER Gábor
2019-09-20 15:37 ` [PATCH 00/15] name-rev: eliminate recursion Derrick Stolee
2019-09-20 17:37 ` SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 00/13] " SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 01/13] t6120-describe: correct test repo history graph in comment SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 02/13] t6120-describe: modernize the 'check_describe' helper SZEDER Gábor
2019-11-27 18:02 ` Jonathan Tan
2019-11-12 10:38 ` [PATCH v2 03/13] name-rev: use strbuf_strip_suffix() in get_rev_name() SZEDER Gábor
2019-11-12 19:02 ` René Scharfe
2019-11-12 10:38 ` [PATCH v2 04/13] name-rev: avoid unnecessary cast in name_ref() SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 05/13] name-rev: use sizeof(*ptr) instead of sizeof(type) in allocation SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 06/13] t6120: add a test to cover inner conditions in 'git name-rev's name_rev() SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 07/13] name-rev: extract creating/updating a 'struct name_rev' into a helper SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 08/13] name-rev: pull out deref handling from the recursion SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 09/13] name-rev: restructure parsing commits and applying date cutoff SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 10/13] name-rev: restructure creating/updating 'struct rev_name' instances SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 11/13] name-rev: drop name_rev()'s 'generation' and 'distance' parameters SZEDER Gábor
2019-11-27 18:13 ` Jonathan Tan
2019-11-12 10:38 ` [PATCH v2 12/13] name-rev: eliminate recursion in name_rev() SZEDER Gábor
2019-11-27 17:57 ` Jonathan Tan
2019-12-09 12:22 ` SZEDER Gábor
2019-11-12 10:38 ` [PATCH v2 13/13] name-rev: cleanup name_ref() SZEDER Gábor
2019-11-27 18:01 ` Jonathan Tan
2019-12-09 12:32 ` SZEDER Gábor
2019-11-12 19:17 ` [PATCH v2 00/13] name-rev: eliminate recursion Johannes Schindelin
2019-11-13 19:25 ` Sebastiaan Dammann
2019-12-09 11:52 ` [PATCH v3 00/14] " SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 01/14] t6120-describe: correct test repo history graph in comment SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 02/14] t6120-describe: modernize the 'check_describe' helper SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 03/14] name-rev: use strbuf_strip_suffix() in get_rev_name() SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 04/14] name-rev: avoid unnecessary cast in name_ref() SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 05/14] name-rev: use sizeof(*ptr) instead of sizeof(type) in allocation SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 06/14] t6120: add a test to cover inner conditions in 'git name-rev's name_rev() SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 07/14] name-rev: extract creating/updating a 'struct name_rev' into a helper SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 08/14] name-rev: pull out deref handling from the recursion SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 09/14] name-rev: restructure parsing commits and applying date cutoff SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 10/14] name-rev: restructure creating/updating 'struct rev_name' instances SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 11/14] name-rev: drop name_rev()'s 'generation' and 'distance' parameters SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 12/14] name-rev: use 'name->tip_name' instead of 'tip_name' SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 13/14] name-rev: eliminate recursion in name_rev() SZEDER Gábor
2019-12-09 11:52 ` [PATCH v3 14/14] name-rev: cleanup name_ref() SZEDER Gábor
2019-12-09 15:08 ` [PATCH v3 00/14] name-rev: eliminate recursion Derrick Stolee
2019-12-11 17:33 ` Junio C Hamano
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